Uses as an easy-to-use protein explorer for structure visualization, analysis. NOC is a powerful software for crystallographic mapping, modelling and refinement and an efficient viewer for GROMACS/AMBER MD trajectories. It allows for import of molecular structures described in the Protein Data Bank (PDB) file format. NOC source code is open for any researching usage including nonprofit commercial redistribution. It is coded in C++, the code structures is simple and extendable.